ValueError: Series.count level is only valid with a MultiIndex
时间: 2024-05-15 13:19:14 浏览: 14
This error occurs when trying to use the `count()` method on a Series object with a single-level index. The `count()` method with a level parameter is only valid when the Series has a MultiIndex.
To resolve this error, make sure that the Series object has a MultiIndex before using the `count()` method with a level parameter.
Example:
```
import pandas as pd
# create a Series with a single-level index
data = {'A': 1, 'B': 2, 'C': 3}
s = pd.Series(data)
# using count() method with a level parameter will raise a ValueError
s.count(level=0)
# to resolve the error, create a MultiIndex for the Series
s = pd.Series(data, index=[['X', 'X', 'Y'], ['A', 'B', 'C']])
# now count() method with a level parameter can be used
s.count(level=0)
```
相关推荐
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)